Incandescent lamp



May 17, 1932.

c. H. LOUTTlT 1,858,712

INCANDESCENT LAMP Filed Dec. 4.. 1929 I N VEN TOR.

' ATTORNEY.

Patented May 17, 1932 UNITED STATES PATENT OFFICE CHARLES H. LOU'I'TIT, OF PORTLAND, OREGON INCANDESCENT LAMP Application filed December 4, 1929. Serial No. 411,587.

This invention relates to an incandescent In the accompanying drawings wherein lamp constructed in a manner as hereinafter like numerals are employed to designate like set forth, in which the globe is formed with parts throughout the same an inner wall and an outer wall to provide a Figure 1 is a sectional plan of a lamp convacuum space therebetween, with such space structed in accordance with this invention. 5

extending around the supporting stem for the Figure 2 is a section taken on the line 2-2 lead-in wires and further extending into the of Figure 1. plug for connecting the lamp with a socket, Referring to the drawings in detail, the thereby preventing the outer globe from benumeral 1 designates an externally threaded coining heated in the use of the lamp and socket plug which may be of any well known further preventing the socket fixture from beconstruction and from which projects a glass coming heated in such use. stem for supporting the usual lead-in wires One of the objects of the invention is to 3 Wh1ch are adapted for connection with a prevent the radiation of heat from the globe suitable filament, not shown. Supported on and socket fixture when the lamp is in use, the stem 2 is a globe consisting of an outer thereby particularly adapting the lamp for wall 4 and an inner wall 5. use in theaters and the like, where the heat The outer wall 4 is formed with a cylinfrom ordinary incandescent lamps often drical neck portion 6 which encircles and causes discomfort to both audience and arsnugly engages the stem 2 and extends into a tists, and further adapting the lamp for use recess 7 formed in the inner end face of the in refrigerating plants, where the heat from plug 1. The neck portion 6 merges into the ordinary lamps has a tendency to counteract main body portion 8 of the outer wall 4, such the cold temperature produced in the plant. main body portion extending in contacting A further object of the invention is to prorelation to the wall of the recess 7 as individe an incandescent lamp having the forecated at 9, and in spaced relation to the plug going characteristics which is adapted for use having its contour broken by a series of anin outside lighting in extremely cold climates gles indicated at 10. without any likelihood of the globe bursting Preferably formed integrally with the due to its contact with icy blasts of wind and neck portion 6, as indicated at 11, is the neck the like. portion 12 of the inner wall 5. The neck por- A further object of the invention is to retion 12 extends in parallel spaced relation duce to a minimum the likelihood of fire da1nto the neck portion 6 and merges into the age to the electrical fixtures associated with main body portion 13 of the inner wall 5, such y the lamp by maintaining the socket plug in a main body portion 18 being disposed within cool condition, and further to permit the use and extending in spaced parallel relation to of shades of ignitible material, such as tissue the main body portion 8 of the outer Wall 4. paper, without any likelihood of the shade Thus it will be seen that a space 14 is probecoming ignited by its contact with the vided between the Walls 4 and 5, with a porglobe or socket plug. tion 15 of the space extending into the recess With the foregoing and other objects in 7 of the plug, and with a neck portion 16 of view, the invention consists of the novel conthe space being disposed in circumferential struction, combination and arrangement of relation to the stem 2. The space 14, as well parts as hereinafter more particularly deas the interior 17 of the inner wall 5 is exscribed, and as illustrated in the accompanyhausted of air in any well known manner, a ing drawings wherein is shown an embodithereby providing a vacuum type inner globe ment of the invention, but it is to be underdisposed within and spaced from a vacuum stood that the description and drawings are type outer globe. to be taken as illustrative and that the inven- It is thought the many advantages of an intion is intended to be limited only b the candescent lamp in accordancewith this inscope of the claims hereunto appende vention will be readily apparent, and al- 2 mama though the preferred embodiment of the invehtlon is as illustrated and described, it is tobe understood that changes in the size, shape and arrangement of parts nfiy be re- 5 sorted to, so long as such changes f within the scope of the invention as defined in the ap ended claims. v

at I claim is 1. An incandescent lamp comprising, a' socket plug, a lead-in wire supporting stem projectmg fromthe plug, and a vacuum-type globe carried by the stem, said globe includmg an outer wall having a neck portion extending longitudinally of the stem in encircling relation thereto and'snugly engaging the stem and further havin a main body portion merging into the nec portion, said globe further including an inner wall havmg a neck portion fused with the neck portion of the outer wall and extending in parallel spaced relation thereto, said inner wall further having a main body portion merging into the neck portion thereof and extending in parallel spaced relation to the main body portion of the outer wall.

2. n incandescent lamp com rising, a socket plug formed in its inner en face with a recess, a lead-in wire supporting stem pro jecting from the plug, and a vacuum-type globe carried by the stem, said globe including an outer wall having a neck portion encircling and snugly engaging the stem and extending into said recess, said outer wall further having a main body portion merging into the neck portion and extending in contactin relation with the wall of the recess, said g obe further includin an inner wall having a neck portion fuse with the neck portion of the outer wall and extending in parallel, spaced relation thereto, said inner wall further having a main body portion merging into the neck portion thereof and extendin in parallel spaced relation to the main b0 y portion of the outer wall.

' In testimony whereof, I ailix my signature hereto.

CHARLES H. LOUTTIT. 

